Backboard of the Backlight Module

ABSTRACT

A backboard adapted on the backside of a backlight module is provided. The backlight module comprises a backboard, a front frame, a light source structure and a group of optical films. The backboard comprises a frame means having an empty central part and a light-shield plate covering the empty central part. The frame means further comprises at least one support means. The front frame is connected to the backboard to form an inner space. The light source structure is placed on the backboard in the inner space. And the group of optical films is placed on the light source structure and in the inner space.

RELATED APPLICATIONS

This application claims priority to Taiwan Application Serial Number97136493, filed Sep. 23, 2008, which is herein incorporated byreference.

BACKGROUND

1. Field of Invention

The present invention relates to a backboard. More particularly, thepresent invention relates to a backboard adapted on the backside of abacklight module.

2. Description of Related Art

Display technology becomes one of the most important technologies in theworld now. Besides the visual part of the display technology, the weightof the display is also an important concern. A more light-weighteddevice is desirable. However, the backboard of the display is often madeby a piece of thick metal board connecting to the front frame. The thickmetal board is heavy and costly.

Accordingly, what is needed is a backboard structure that results inlower weight and lower cost without affecting the supporting mechanismto overcome the above issues. The present invention addresses such aneed.

SUMMARY

A backboard is provided. The backboard comprises a frame means and alight-shield plate. The frame means has an empty central part, whereinthe frame means further comprises at least one support means; thelight-shield plate covers the empty central part.

Another object of the present invention is to provide a backlightmodule. The backlight module comprises a backboard, a front frame, alight source structure and a group of optical films. The backboardcomprises a frame means having an empty central part and a light-shieldplate covering the empty central part. The frame means further comprisesat least one support means. The front frame is connected to thebackboard to form an inner space. The light source structure is placedon the backboard in the inner space. And the group of optical films isplaced on the light source structure and in the inner space.

It is to be understood that both the foregoing general description andthe following detailed description are by examples, and are intended toprovide further explanation of the invention as claimed.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention can be more fully understood by reading the followingdetailed description of the embodiment, with reference made to theaccompanying drawings as follows:

FIG. 1 is a backlight module of the first embodiment of the presentinvention;

FIG. 2A is a diagram of the frame means of the first embodiment of thepresent invention;

FIG. 2B is a top view of the frame means of the first embodiment of thepresent invention;

FIG. 2C is a cross-sectional view of the support means along the Adirection in FIG. 2B of an embodiment of the present invention;

FIG. 2D is a cross-sectional view of the support means along the Adirection in FIG. 2B of another embodiment of the present invention;

FIG. 3A, FIG. 3B and FIG. 3C are cross-sectional views of the backlightmodule of an embodiment of the present invention respectively;

FIG. 4A is a diagram of the frame means of another embodiment of thepresent invention; and

FIG. 4B is a top view of the frame means of another embodiment of thepresent invention.

DETAILED DESCRIPTION

Reference will now be made in detail to the present embodiments of theinvention, examples of which are illustrated in the accompanyingdrawings. Wherever possible, the same reference numbers are used in thedrawings and the description to refer to the same or like parts.

Please refer to FIG. 1, a backlight module 1 of the first embodiment ofthe present invention. The backlight module 1 comprises a front frame10, a group of optical films 11, a light source structure 12 and abackboard 13. The front frame 10 is placed on a front side of thebacklight module 1 and is connected to the backboard 13. The lightsource structure 12 substantially comprises a light source (not shown),a light guide plate 12 a and a reflector 12 b, etc. The group of opticalfilms 11 is placed on the light source structure 12, wherein the groupof optical films 11 and the light source structure 12 are both fixed inan inner space (not shown) formed between the front frame 10 and thebackboard 13.

The backboard 13 comprises a frame means 2. FIG. 2A is a diagram of theframe means 2 of the first embodiment of the present invention. In thepresent embodiment, the frame means 2 comprises 2 L-shaped frame members20 and 21 adapted to each other. Therefore, an empty central part 22 isformed between the frame members 20 and 21. The frame members 20 and 21are made of metal material in the present embodiment. As shown in FIG.2B, a top view of the frame means 2 of the first embodiment of thepresent invention, the support means 200, 201 and 202 are further formedon the frame means 2, wherein the support means 200 is formed on theL-shaped frame member 20, and the support means 201, 202 are formed onthe L-shaped frame member 21. The two L-shaped frame member 20 and 21may be welded together to form the frame means 2, thus two welding lines203 and 204 are formed between the frame members 20 and 21. Thestructure of the support means 200, 201 and 202 is as depicted in FIG.2C, which is a cross-sectional view of the support means 200 along the Adirection in FIG. 2B. The structure of the support means 200 in FIG. 2Cis a trench 205. In another embodiment, the support means is a bulge 206as depicted in FIG. 2D. Both of the structures reinforce the supportingmechanism of the frame means. The number of support means can bedifferent in other embodiments.

The backboard 13 further comprises a light-shield plate 3 covering theempty central part 22 of the frame means 2. The light-shield plate 3 canbe a plastic film or metal foil in different embodiments. The backboard13 comprising the light-weighted light-shield plate 3 and the framemeans 2 with empty central part 22 is far lighter than a backboard madeby a thick heavy metal board. Further, the light-shield plate 3 costsless as compared to the metal board. The metal foil type of thelight-shield plate 3 with high thermal conductivity not only blocks thelight from the light source structure 12 but also provides a greatheat-dissipating mechanism. The position of the light-shield plate 3 canvary in different embodiments. In FIG. 3A, a cross-sectional view of thebacklight module 1, the light-shield plate 3 is connected to an innerside of the light source structure 12. In another embodiment as depictedin FIG. 3B, the light-shield plate 3 is connected between an outer sideof the light source structure 12 and an inner side of the frame means 2.In yet another embodiment, the light-shield plate is connected to anouter side of the frame means 2. No matter in which embodiment describedabove, the light shield plate 3 can cover the empty central part 22 ofthe frame means 2 to block the light from the light source structure 12.

In another embodiment, the frame means 2 comprises four bar-shaped framemembers 40-43 adapted to each other as depicted in FIG. 4A and FIG. 4B.Also, the frame members 40-43 can be welded together to form the framemeans 2, thus there are four welding lines 400-403 between each twoneighboring frame members, and an empty central part 42 is formed in thecenter of the four frame members 40-43. Support means 404, 405, 406 areformed on the frame members 41, 42 and 43 respectively to provide asupporting mechanism. Yet in another embodiment, the frame means 2 canbe one-piece formed.

The backboard of the present invention comprises a frame means and alight-shield plate that lower the weight and the cost. The support meanson the frame means further reinforce the supporting mechanism of theframe means, and the light-shield plate provides the light-shielding andheat-dissipating mechanism.

It will be apparent to those skilled in the art that variousmodifications and variations can be made to the structure of the presentinvention without departing from the scope or spirit of the invention.In view of the foregoing, it is intended that the present inventioncover modifications and variations of this invention provided they fallwithin the scope of the following claims.

1. A backboard adapted on the backside of a backlight module, whereinthe backboard comprises: a frame means having an empty central part,wherein the frame means further comprises at least one support means;and a light-shield plate covering the empty central part.
 2. Thebackboard of claim 1, wherein the frame means comprises two L-shapedframe members adapted to each other.
 3. The backboard of claim 1,wherein the frame means comprises four bar-shaped frame members adaptedto each other.
 4. The backboard of claim 1, wherein the frame means ismade of metal material.
 5. The backboard of claim 1, wherein the supportmeans is a trench.
 6. The backboard of claim 1, wherein the supportmeans is a bulge.
 7. The backboard of claim 1, wherein the light-shieldplate is connected to an inner side of the frame means.
 8. The backboardof claim 1, wherein the light-shield plate is connected to an outer sideof the frame means.
 9. The backboard of claim 1, wherein thelight-shield plate is a plastic film.
 10. The backboard of claim 1,wherein the light-shield plate is a metal foil.
 11. A backlight modulecomprises: a backboard comprising a frame means and a light-shieldplate, wherein the frame means has an empty central part and thelight-shield plate covers the empty central part; a front frame placedon the backboard in the inner space; a light source structure formed onthe backboard in the inner space; and a group of optical films placed onthe light source structure in the inner space.
 12. The backlight moduleof claim 11, wherein the frame means further comprises at least onesupport means on a surface of the frame means.
 13. The backlight moduleof claim 11, wherein the frame means comprises two L-shaped framemembers adapted to each other.
 14. The backlight module of claim 11,wherein the frame means comprises four bar-shaped frame members adaptedto each other.
 15. The backlight module of claim 11, wherein the framemeans is made of metal material.
 16. The backlight module of claim 11,wherein the support means is a trench.
 17. The backlight module of claim11, wherein the support means is a bulge.
 18. The backlight module ofclaim 11, wherein the light-shield plate is connected to an inner sideof the light source structure.
 19. The backlight module of claim 11,wherein the light-shield plate is connected between an outer side of thelight source structure and an inner side of the frame means.
 20. Thebacklight module of claim 11, wherein the light-shield plate isconnected to an outer side of the frame means.